Simple Catch Menu and Image Borders

I just started using wordpress. I was wondering if anyone knows how to get rid of borders around images? I’m using NextGen Plug In and I want to display my photos without borders. I believe it is the Simple Catch template that is causing the problem.

Also, another problem I have is that the home page menu is different than the gallery pages/blog. When you go to the gallery pages or blog page.. a white bar appears under the menu. How do I fix this?